Metallic packing-ring.



F. DEVENTER.

METALLIC FACKINGRING. APPLxcATmN msu MAR. 19. 1914.

Lmy Patented Febgi, 191B.

FRANZ DEVENTER, 0F HANOVER, GERMANY.

METALLIC PACKING-RING.

Specification of Letters Patent.

Patented Feb.. i9, i918,

AppIication filed March 19, 1914. Serial No. 825,915.

T 0 all whom it may concer? Be it known that I, FRANZ DEVENTER, a citizen of the German Empire, and residingI at Hanover, German Empire, have invented a new and useful Improved Metallic Facking-Ring, of which the following is a full, clear, and exact description.

The object of the present invention is to produce metallic packing rings by high pressure According to the invention a yielding and at the same time automatically lubricating packing ring is attained, suitable for all sorts of glands.

It has been proposed to form rings of this kind from comparatively short metal pieces in the form of shavings or the like with the addition of asbestos fibers, graphite and similar materials, by compressing the same. Rings of this kind do not possess sufficient strength and resistance.

According to the present invention the fundamental material consists of fibrous materials of long fiber, having sufficient length,

approximately to form the ring. In this case, a metal is advantageously employed having but small frictional coefficient in comparison with cast iron, steel, bronze and the like, and of great flexibility.

Experiments have shown that fibrous metal such as lead or a lead alloy, consisting of' long, thin, fiat fibers are most suitable for the purpose in view.

Metallic fibers of this kind are cut to a length corresponding approximately to the size of the ring to be produced. These fibers are spread on a suitable flat surface and coated, as evenly as possible with a suitable, highly refractory fatty preparation. The fibers thus prepared are then treated, also as evenly as possible with American graphite so that all surfaces and intermediate spaces of the fibers are coated and filied out with the fatty material. The bunch of fibers thus treated is advantageously more or less tightly twisted together and placed in a mold. The mold consists of a matrix having an annular recess, a central mandrel or pin and a die of corresponding annular shape. Several rings of the above mentioned metallic fibrous material are advantageously placed in a mold. to (ill the same. This hasl the advantage that the lubricating material becomes more intimately mixed with the metal and that the contacting ends of the fibers are staggered, so to say, as regards each other, z'. c 'they do not lie in the same plane. The mold when thus filled is subjected to a high pressure, about 500 kg. per square centimeter, e'. e. 500 atmospheres; and thus a packing ring is produced having a perfectly smooth exterior surface, a ring of great durability and' possessing the following advantages Owing to the compression of the many windings and interlaced threads of soft metal, a great number of hollow spaces are formed, which are filled with the lubricating mediunr The fibers are, however, so intimately combined, by the pressure employed, that the ring produced is concrete. The 1naterial possesses high tearing resistance, but is at the same time, yielding and readily conforms to varying pressure in the glands.

vWhen the glands are tightened up the lubricating medium is pressed outj of the metal on to the walls of the glands, and the durability of the ring is insured by the fibrous nature of the material.

In rings of this kind a capillary effect is produced which retains the lubricating medium. it is disadvantageous of the packing material hitherto known, that the lubricating` material is mainly used up in the initial stage, so that the packing does not last long.

In the packing forming the object of the present invention; owing to the fact that, by its nature the graphite and the lubricating material are evenly distributed friction is almost avoided. it is no longer necessary to employ a closing ring or cover, of white metal.

Asbestos fibers may be mixed with the metallic fibers for special purposes.

In the accompanying drawings Figure l is a central section through a packing ring made according to the present invention, Fig. 2 is a plan and Figs. 3 and 4 represent cross-section and side view respectively of the bunch of fibers. A

Further description of the drawings is unnecessary. I t

The lubricating material may be added to the metallic fibers after they have been compressed, if the compressed ring is dipped in a` bath of lubricating material, advantageously warmed, and allowed to remain in the same until the pores of the same are com-- pletely filled. The lubrication of the rings may be renewed in the same manner for years.

claim as my invention A metallic packing ring consisting of thin,

lat, soft metal threads of suoient length to In`testi1nony whereof I affix my signature extend approximately around the ring, in the presence of two witnesses.

twisted together to form a great number of small hollow spaces in which lubricant Ine- FRANZ DEVENTER' dium is mixed, said metal threads and lubri- Witnesses: cant having been subjected to high pressure T. HENRY REED, to obtain the desired shape and form. MERWIN NPALUN. 

